Journal of Taiwan Agricultural Research

Author:Chia-Hsun Ho, Man-Hsia Yang, and Huey-Ling Lin*

Abstract:

In this study, the purple leafy sweet potato strain CYY84-67 bred by the Chiayi Agricultural Experiment Branch was used in the field experiment from 2016 to 2018 at Taiwan Agricultural Research Institute. A total of 24 different experimental and meteorological data were collected from 3 consecutive harvests in each cultivation period within two years. The objective of this study was to study the effects of temperature and solar radiation on the growth traits and plant elements of purple leafy sweet potato to summarize the optimal cultivation periods for purple leafy sweet potato as well as to clarify the rise and fall of temperature and solar radiation on plant elements. The canonical correlation analysis was adopted to explore the linear relationship between two groups of variables, and the weight of maximizing the correlation between the two sets of variables was calculated. The results of this study showed that purple leafy sweet potato CYY84-67 had the highest yield per unit area in both spring and autumn. The growing degree days (GDD), accumulated daily solar radiation (ADSR), and accumulated diurnal temperature regimes (ADTR) were the major meteorological variables affecting leaf area, dry weight of leaves and stems in purple leafy sweet potato, and ADSR had the greatest weight. In addition, GDD, ADSR, and ADTR also affected plant element contents from the leaves and stems of purple leafy sweet potato CYY84-67. Among these meteorological variables, GDD had the greatest weight on the calcium of the leave, while ADSR had the highest weight on the phosphorus of the stem.

Key words:Purple leafy sweet potato, Temperature, Solar radiation, Growth trait, Plant element

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